Question: What is the chemical compound with the least acceptable daily intake?
Paraphrase: What chemical compound has the least daily intake acceptability?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q11173 . ?ent wdt:P2542 ?obj . ?ent wdt:P31 wd:Q11173} ORDER BY ASC(?obj)LIMIT 5 
Answer: pentachlorobenzene, Brilliant Blue FCF